JPH0113752B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a gas collecting main generally called a dry main that collects coke oven gas generated in a coke oven from a carbonization chamber through a riser pipe and a bend pipe. This invention relates to a method for repairing a corroded part near a dish valve mounting frame.

Prior Art and Its Problems As shown in Fig. 4, a coke oven dry main is connected by a flange to the upper side of a riser pipe 1 whose lower end is embedded in the oven top brick at the end of the coking chamber of the coke oven. The lower end opening of the bent pipe 2 is inserted into the annular ammonium water receiving part of the on-off valve 5 of the dish valve 4 provided on the top surface of the dry main to seal the gas generated from the coke oven carbonization chamber, and also to seal the gas generated from the coke oven carbonization chamber. and dish bento 4
An annular packing receptacle is provided from the inner wall of the pipe, and the connection is sealed with asbestos packing or the like. The plate valve 4 is bolted to a plate valve mounting frame 7 made of cast iron and riveted onto the dry main 3.

Normally, once a coke oven starts operating, the
Although it is operated continuously for 30 years until it becomes obsolete, the area near the plate valve mounting part on the top surface of the dry main 3 is contaminated with tar and ammonium water leaking from the operating shaft of the on-off valve 5, the packing seal, or cracks in the bend pipe 2. It is severely corroded by gases, etc., and gas leaks occur due to perforations after long-term use.

Conventionally, the dry main body was replaced when it was damaged by corrosion, but when replacing it, the entire furnace group had to be kept hot in an actual kiln, and apart from the replacement work, various types of maintenance work were carried out for hot keeping. Countermeasures were required, which not only required extremely large-scale construction, but also required enormous construction costs and a considerable number of days.

Therefore, the present inventors searched for various methods to repair the corroded parts without replacing the dry main body, and as a result of measuring the wall thickness of the dry main body and visually observing the inside of the dry main body in a dormant furnace, we found that It was confirmed that the corrosion was concentrated on the top surface where tar and ammonium water leaked and that other parts were hardly corroded and had sufficient strength and durability. We focused on

However, since the main body of the dry main body is made of general structural steel and the mounting frame for the countersunk valve is made of cast iron, the corroded parts on the top of the main body of the dry main body are covered and repaired using plates made of structural steel or stainless steel. However, it is difficult to weld the joint with the plate valve mounting frame. Therefore, if weight is applied to the dish valve mounting frame due to the inclination of the riser pipe, etc.,
There was a problem where the plate valve mounting frame could not be avoided.

Purpose of the Invention This invention provides a method for covering and repairing corroded parts near the dish valve mounting frame of a coke oven dry main.
The purpose of the present invention is to propose a method for repairing a coke oven dry main that can prevent the plate valve mounting frame from collapsing even when weight is applied to the plate valve mounting frame due to the inclination of the riser pipe.

Composition of the Invention The present invention provides a method for covering and repairing a corroded portion near a dish valve mounting frame of a coke oven dry main, in which both sides of the dish valve mounting frame attached to the top surface of the dry main are covered with At the same time, an equilateral angle bar is fixed by welding along the upper half of the dry main, and a plurality of fasteners are welded to the equilateral angle bar to support the dish valve mounting frame. A method of repairing a coke oven dry main in which a reinforcing plate is covered and welded between equilateral angle bars, and a steel strip is fixed by welding along the side of the remaining dish valve mounting frame that does not meet the equilateral angle bars, and multiple pieces are attached to the strip. Weld the stopper fittings to support the plate valve mounting frame, then weld a reinforcing plate between the equilateral angle bars on the upper half of the dry main, and weld multiple reinforcing ribs to the steel strip that extend around the upper half of the dry main. The main purpose of this paper is to explain how to repair coke oven dry mains.

The present invention will be described below based on an embodiment shown in FIGS. 1 to 3.

FIG. 1 is a plan view, FIG. 2 is a longitudinal sectional front view, and FIG. 3 is a longitudinal sectional front view of the portion to which the dish valve is attached.

In the repair method of the present invention, the plate valve mounting frame 7, which is attached to the upper surface of the dry main 3 with studs 11 at a predetermined interval, is attached along both sides perpendicular to the longitudinal direction of the dry main 3 and on the top of the dry main 3. Equilateral angle irons 12, 12 are attached to the dry main 3 by welding along the half circumference, and steel strips 13, 14 are welded along the remaining sides of the dish valve mounting frame 7 where the equilateral angle irons 12, 12 do not lie along. Attach to dry main 3 by.

And the steel strip 13 between the equilateral angle steels 12, 12,
Reinforcement plate 15 from 14 to the upper half of the dry main 3,
16 and repair the covering. In this case, the reinforcing plates 15 and 16 are surrounded by steel strips 13 and 1
4. Weld to the equilateral angle bars 12, 12 and the dry main 3.

Further, a plurality of fasteners 17 are arranged on the side of the plate valve mounting frame 7 of the steel band 13, and one side of the fasteners 17 is connected to the steel band 13 and the equilateral angle bar 12, and a stud 11 whose head comes out from the perforation is provided. Fix the area around it by welding.

A plurality of L are provided at predetermined intervals on the portions of the equilateral angle irons 12, 12 that are in contact with the plate valve mounting frame 7 and on the steel strip 14.
One surface of the shaped stopper 18 is positioned on the upper surface of the plate valve mounting frame 7, and the equilateral angle bars 12, 12 and the steel strip 14 are attached.
Each L-shaped stopper 18 and bolts inserted upward into the bolt holes 19 for mounting the countersunk valve of the countersunk valve mounting frame 7 are fixed by welding.

One end is welded to each L-shaped stopper 18 fixed to the steel band 14, a reinforcing rib 21 is welded and fixed along the reinforcing plate 16, and one end is welded to the steel band 13 and reinforced along the reinforcing plate 15. A plurality of ribs 22 are welded and fixed.

Note that the upper surface of the dry main 3 between the equilateral angle bars 12 on the sides of the adjacent dish valve mounting frame 7 may be covered and repaired with a reinforcing plate if necessary.

In addition, when installing the countersunk valve 4, since the L-shaped stopper 18 attachment part cannot be bolted, insert the countersunk valve stopper 23 shown in FIG. 3 into the flange of the countersunk valve 4 between the L-shaped stops 18, and Angle steel 12 and steel strip 14
The bolt 25 is tightened and fixed to the nut 24 welded to the bolt 24, and the rest is bolted to the plate valve mounting frame 7 in the conventional manner.

Function As described above, when repairing the covering of the corroded part near the plate valve mounting frame of a coke oven dry main, the present invention covers the area along both sides perpendicular to the longitudinal direction of the dry main 3 and the upper half circumference of the dry main 3. Since the countersunk valve mounting frame 7 is supported by a plurality of L-shaped fasteners 18 welded to the equilateral angle bars 12, 12, the countersunk valve mounting frame 7 made of cast iron and a reinforcing plate made of structural steel or stainless steel are connected. 15 and 16, the load applied to the plate valve mounting frame 7 is transferred to the equilateral angle bars 1 on both sides via the L-shaped fasteners 18.
It was accepted at 2.12. Therefore, even if a large load is applied to the dish valve mounting frame 7 due to the inclination of the riser pipe 1, etc., the dish valve mounting frame 7 is prevented from collapsing.

Furthermore, in addition to the above-mentioned equilateral angle bars 12, 12, a plurality of stoppers 17 welded to the remaining steel strips 13, 14 along the sides of the remaining plate valve mounting frame 7 are attached to the plate valve mounting frame 7.
By supporting the steel strips 13 and 14 and providing a plurality of reinforcing ribs 21 and 22, the load capacity of the dish valve mounting frame 7 can be further increased.

Effects of the Invention According to the repair method of the present invention, when covering and repairing a corroded part near the dish valve mounting frame of a coke oven dry main, the dish valve can be used when the reinforcing plate and the dish valve mounting frame cannot be welded due to the difference in materials. By reinforcing the load capacity of the mounting frame, it is possible to prevent the dish valve mounting frame from collapsing, and the service life of the dry main body can be significantly extended.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the coke oven dry main repair method of the present invention, Fig. 2 is a longitudinal sectional front view of the same, Fig. 3 is a longitudinal sectional front view showing the method of installing the dish valve, and Fig. 4. FIG. 2 is a longitudinal sectional front view showing a method of connecting a coke oven riser pipe and a dry main. In the figure, 3... dry main, 7... dish valve mounting frame,
12...Equilateral angle steel, 13,14...Strip steel, 15,1
6... Reinforcement plate, 17... Stopper, 18... L-shaped stopper, 21, 22... Reinforcement rib.

Claims (1)

[Claims] 1. A method for covering and repairing a corroded part near a dish valve mounting frame of a coke oven dry main, comprising:
Along both sides perpendicular to the longitudinal direction of the dry main of the dish valve mounting frame attached to the top of the dry main,
Then, an equilateral angle bar is fixed by welding along the upper half of the dry main, and a plurality of fasteners are welded to the equilateral angle bar to support the dish valve mounting frame, and then the equilateral angle bar of the upper half of the dry main is fixed by welding. A method for repairing a coke oven dry main, which is characterized by welding reinforcing plates between steel plates. 2 Along the side of the remaining plate valve mounting frame where the equilateral angle iron does not line up, a steel band is fixed by welding, and a plurality of fasteners are welded to the steel band to support the plate valve mounting frame, and then drying is carried out. A coke oven according to claim 1, characterized in that a reinforcing plate is cover-welded between the equilateral angle irons on the upper half of the main main, and a plurality of reinforcing ribs extending over the upper half of the dry main are welded to the steel strip. How to repair dry main.